Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Mellum2-12B-A2.5B-Thinking
59
Step 3.7 Flash
71
Pick Step 3.7 Flash if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Thinking only becomes the better choice if coding is the priority.
Coding
+13.6 difference
Mellum2-12B-A2.5B-Thinking
Step 3.7 Flash
N/A
$0.2 / $1.15
N/A
N/A
N/A
N/A
128K
256K
Pick Step 3.7 Flash if you want the stronger benchmark profile. Mellum2-12B-A2.5B-Thinking only becomes the better choice if coding is the priority.
Step 3.7 Flash is clearly ahead on the provisional aggregate, 71 to 59. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Step 3.7 Flash gives you the larger context window at 256K, compared with 128K for Mellum2-12B-A2.5B-Thinking.
Step 3.7 Flash is ahead on BenchLM's provisional leaderboard, 71 to 59.
Mellum2-12B-A2.5B-Thinking has the edge for coding in this comparison, averaging 69.9 versus 56.3. Step 3.7 Flash stays close enough that the answer can still flip depending on your workload.
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